Droking 4-20mA Signal Generator Constant Current Source Ampere Meter, Handheld Device Digital Display Current Generator

Product Features:
1. This product is provided with current meter, accurate digital display.
2. The current output value can be fixed: According to your adjustment , the output current can be fixed to the set value automatically and can be used as constant current source. When it is used as constant current source, the max. output current cannot be more than 20mA.
3. Testing if the output is normal: you can use multimeter (DC current) to shorten the current output + terminal and current output - terminal, then check if the displayed value is the same as the multimeter.

Output Impedance Matching of 4-20mA Current Generator:
The output source impendence should meet the following needs:
According to the formula: I=U/R (Current= Voltage/impedance), the voltage of your power supply divided by the signal impedance is the max. current that generated by the signal receiving terminal.
Besides, there is impedance with this current generator, so the formula should be the voltage of power supply / (the signal impedance of the device+ the impedance of the current generator)= output constant current
Since the voltage range of power supply of this product is 4-35V, if the practical voltage of the power supply is low and the impedance of the device is high, the product cannot provide enough constant current.
Here are the signal matching demands of this product:
When the power supply is 24V, the signal impedance cannot be more than 1000ohm.
When the power supply is 12V, the signal impedance cannot be more than 500ohm.
When the power supply is 5V, the signal impedance cannot be more than 200ohm.
If the signal impedance is higher than the above parameters, you can increase the voltage of power supply or decrease the signal impedance to solve the current shortage of the constant current source. Please note that the voltage of the power supply cannot be higher than 28V.

• Easy to use, simple wiring, knob operation, immediately output after adjusting, no delay; Wide voltage range of power supply: DC 5-28V (recommended range: DC 12-24V).
• Our generator is provided with perfect protective function: with input voltage reversed connected protection. The product will not work when it is reversed connected, which effectively protect the product from burning..
• Standard input current range: manually adjusting the potentimeter on the product can provide 4-20mA current output, which can be used in the application that needs. Stable current adjustment: This product adopts wire wound potentiometer to adjust the current, which is stable and can avoid the trouble caused on normal carbon film potentiometer, like the abrupt electrical resistance change..
• With scale plate, this product can distinguish the running state of the device immediately according to the scale value. Perfect size, convenient to handing out, makes work become an enjoyment..
• Wide application: signal generator, valve adjustment, frequency converter controlling, PLC testing, panel testing, LED testing, simulating the output of transmitter.